Table 4.
Effect of the direct return cotton stalks and root stubble with V. dahliae to the field on the number of cotton Verticillium wilt microsclerotia in the cotton rhizosphere soil (DS70: the samples on the 70th day of the cotton rhizosphere soil in diseased soil containing V. dahliae; SS70: the samples of the 70th day of the cotton rhizosphere soil in sterilized diseased field soil).
| Treatments | Number of cotton Verticillium wilt microsclerotia (CFU g−1) | Growth multiples | |
|---|---|---|---|
| DS70 | Cotton stalks infected with V. dahliae | 9.97 ± 5.91 b | +2.54 |
| Root stubble infected with V. dahliae | 26.43 ± 9.55 a | +8.37 | |
| Cotton plants infected with V. dahliae | 14.80 ± 0.76 ab | +4.25 | |
| Sterilized cotton stalks | 4.98 ± 1.63 b | +0.77 | |
| Sterilized root stubble | 3.26 ± 0.46 b | +0.16 | |
| Sterilized cotton plants | 3.67 ± 0.70 b | +0.30 | |
| CK | 3.55 ± 2.09 b | +0.26 | |
| Soil samples during sowing | 2.82 ± 0.42 | ||
| SS70 | Cotton stalks infected with V. dahliae | 5.02 ± 1.10 a | – |
| Root stubble infected with V. Dahliae | 0.20 ± 0.20 b | – | |
| Cotton plants infected with V. dahliae | 3.21 ± 0.58 a | – | |
| Initial cotton stalks sample | 11.38 ± 5.77 | – | |
| Initial root stubble sample | 0.08 ± 0.03 | – | |